Math is beautiful, surprising, and complex. He really explains this one thoroughly.
Thursday, November 30, 2023
Tuesday, November 28, 2023
Bystander effect
Conflicting rules of helping those in need and confirming to those around you (who aren't helping.)
Psychology of rage (impulsions) Hidden Brain
This is the podcast about rage and the uncontrolled behaviors it evokes. The transcript is quicker to read than listening to the whole podcast, but both are available at the link below.
"how does this happen? That you can instantly do this aggression without even being aware, and it's all unconscious? If something in my environment could cause me to suddenly risk life and limb with no conscious thought, I wanted to understand how that worked at a neuroscience level. What's going on in the brain?...The question again was why evolution, which has sculpted our brains and bodies to be skilled survival machines, would preserve systems in the brain that caused us to act with unthinking haste, and violence. Haste and violence that can place our own lives at great risk."
"The conscious brain is too slow and it doesn't have the capacity. So when you're faced with a sudden threat, like a fist thrown to your chin, you have to respond faster than the conscious brain can handle it....So nature has developed high-speed pathways to the amygdala, all our senses go there before they go to the cortex, which is where we have consciousness. And that so you can have this rapid response to a real threat."
" Rational thought isn't just unhelpful. When that basketball is hurtling toward you, it's actually counterproductive. Being deliberate can end up getting you smashed in the face. But short-circuiting logic creates dangers, especially when you're in the grip of an emotion like rage. You can literally stop thinking about your arm as your arm. It becomes a weapon that can be wielded, deployed, sacrificed."
"Rage, in other words, can be productive not because it benefits us or our individual self-interest, but because it helps the groups to which we belong. Rage, in fact, might be one way that nature gets us to prioritize the interest of our groups over our narrow self-interest. By disabling logic and impairing reason, we can be prompted to do things that we would never do if we were only looking out for ourselves."
Sunday, November 26, 2023
Bosch Icon for the win for best windshield wiper
https://youtu.be/g3S8udUSKtY?si=hnf1blWx3mGAzrRM
Best windshield wiper after 1 year Project Farm
Saturday, November 25, 2023
How the SR-71 was developed so quickly and brilliantly
This is such a good lecture! It's the story of innovations (under incredible time pressure) at Locked Martin's skunkworks.
If you don't have time, tease yourself with a start at 26:29.
26:30 the extreme conditions of operation of the SR-71 plane
- at Mach 3 the plane world stretch 3" because of friction-heating
- regular electronics, fuel, and lubricants of the time wouldn't function at it's operating conditions.
-the fuel tanks get so hot that regular fuels would spontaneously combust, so they had to find a heavier fuel with a high flash point.*
29:19 at peak altitude, the cone in front of the engine provides about 70% of the thrust, the afterburners about 25%, and the actual turbine inside the engine, about 5%.
30:04 Some problems were not solved. There was no existing sealant for the fuel lines that would work across all operating temperatures, so they simply didn't completely seal the system, allowing it to just sit there and spill fuel on the ground when awaiting takeoff.
(and speaking of fuel)
32:07 the plane couldn't generate enough lift to get an adequate amount of fuel airborne, so it depended on mid-air fueling just to reach cruising altitude and complete a mission.
34:56 it was literally faster than the muzzle velocity of a speeding bullet
Since this YouTube is ultimately a lecture about team leadership, he explains his favorite over-arching skunkworks rules. (Kelly Johnson's rules)
47:00 Use a small number of people ("must be restricted in a vicious manner")
Good leaders hire good people and trust them to do good work. They can't be completely "hands-off" - give them context and the information they need to make the right decisions. (50:18 But not so much context that they turn off their brains and wait to be told what to do.)
Have a very simple drawing (and drawing release) system that allows great flexibility.
One objective - get a good airplane built on time. (They compromised on things that wouldn't get the plane delivered on time.)
Provide incredible freedom and trust in your team.
*"At the speeds at which the SR-71 operates, lighting the afterburner has been equated to "keeping a candle lit in a hurricane". The higher boiling point of JP-7 keeps it from vaporising readily, and the exhaust velocity is pretty high, making sustained combustion problematic. A reliable method had to be found to ignite the excess fuel dumped into the combustion chamber, TriEthylBorane ignites spontaneously in contact with oxygen generating very high temperatures thus ensuring that the engine 'catches' on the first strike." -Quora
Friday, November 24, 2023
Cow stomach sensor predicts calving
13:50 Gigantic "pill" sensors transmits rumination data including body temperature, which drops significantly 12 hours before calving, with few false alarms, he says.
Thursday, November 23, 2023
Tuesday, November 21, 2023
Electric ferry
Electric ferry
5:44 Cruise quietly at 6 knots for 15 hours on it's 190kWh battery that charges with a regular charging CCS cable
Comfy micro car
A slightly more comfortable micro-car with removable battery packs you charge indoors (if you don't want to charge at a charging station)
Sunday, November 19, 2023
Dashcams that can actually see license plates
If you can stand this guy's voice for more than a few seconds, he goes through the difference in resolution on dashcams in exhaustive detail.
The future of robots
Cost of robot vs employee
4:50 $12/hr x 2000hr/yr = $24K/yr /worker
$10K + $3500/mo = 10K + $42K/yr
$10K + $3500/mo = 10K + $42K/yr
15:21 Plastic manufactured per capita worldwide: 14.5E6 * 2000 lb = 29E9/ 3E8 = 100 lb per capita per year
15:44 still only saw a recycle rate of about 35% in 2018
19:07 Zume developed packaging that's backyard recyclable (ie not "compostable in certain industrial facilities" that control temperature and other factors.)
22:08 plastic containers are slightly cheaper than their compostable counterparts, but not much.
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